Question: What Class IIIB combustible liquid has the highest vapor pressure?
Paraphrase: What is the combustible liquid has the highest vapor pressure in Class IIIB?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009059 . ?ent wdt:P2119 ?obj } ORDER BY DESC(?obj)LIMIT 5 
Answer: tetramethyl silicate, thioglycolic acid, methylcyclopentadienyl manganese tricarbonyl, disulfur dichloride, resorcin